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    Echinodorus lanceolatus Rataj

    Echinodorus lanceolatus Rataj


    Basionym of : Aquarius lanceolatus (Rataj) Christenh. & Byng

    Root: adventitious on the rhizome and clonal on the inflorescence. Stem: rhizome spindle-shaped; stem glabrous/not winged/triangular. Leaf: exserted elliptic/lanceolate/tip acute/base acute/veins acrodromous/translucent form absent; petiole triangular; submerged absent. Inflorescence: cymes erect/triangular/not winged/with vegetative propagation. Flower: monoclinal long pedicel/stalk cylindrical; sepal concave ovate/glabrous/persistent and recurved below achene; petal white/ovate; stamen number 18 to 24/stamens rounded/stamens acute; carpel freely numerous over 20. Fruit: obovate/3 to 4 ribbed/trichomes absent/1 to 5 gland(s)/gland(s) lenticular/beak erect. Seed: Shape obovate with ornamented surface.[1]

    Description 60-100 cm tall, glabrous. Rhizome spindle-shaped, approx. 2.5 cm long. Leaves elliptic to lanceolate emerged, 10-27 cm long, 2.5-5 cm wide, apex acute, base thin to acute, acrodromous, 5-7 veins; secretory translucent ducts hidden; petiole triangular, 18-86 cm long; sheath 15-26 cm long. Inflorescence zymose; peduncle 52-121 cm long, erect, triangular, winged; rachis 27-29 long, triangular, not winged, 5-9 whorls, vegetative multiplication present; bracts ovate to lanceolate 10-25 mm long, glabrous, apex caudate. Flowers long-stalked; pedicel 3-3.5 mm long, semicircular; sepals ovate, recurved and not surrounding the acheneethum, 10-11 mm long; petals ovate, 10-12 mm long, without claws; stamens 19-24, secretory structures on dorsal side of anthers absent; carpels numerous, over 20. Achenes obovate, 2-2.4 mm long, 1-1.3 mm wide, 4 ribbed, trichomes absent on ribs, 1-4 glandular, gland lenticular, beak erect, ca. 0.2 mm long. Seeds ca. 1.3 mm long.[1]

    Echinodorus lanceolatus is very similar to E. paniculatus. However, the fruits of E. lanceolatus have small glands, 1-5 units on the fruit surface, between the ribs, very often 4; and the mantle surface has longitudinal ribs and convex surfaces. Anatomical differences between these species can be seen in: Matias, L.Q., Soares, A., Scatena, V.L. 2008. anatomy of Echinodorus (Alismataceae) scapes from northeastern Brazil in relation to taxonomy. Edinburgh J.Bot. 65(1):11-21; Matias, L. Q., Soares, A., Scatena, V. L. 2007. Systematic consideration of petioles of species of Echinodorus (Alismataceae) scapes from northeastern Brazil. Flora 202: 395-402[1]

    1. 1.0 1.1 1.2 Matias, L.Q. 2020. Alismataceae in Flora do Brasil 2020. Jardim Botânico do Rio de Janeiro.Available at: <>. Accessed on: 14 Nov. 2021
    2. Louisiana State University, Shirley C. Tucker Herbarium (LSU-Vascular Plants)
    3. Collected in Brazil by Royal Botanic Gardens, Kew
    4. Echinodorus lanceolatus Rataj Collected in Brazil by Meise Botanic Garden
    5. Echinodorus lanceolatus Rataj Collected in Brazil by Meise Botanic Garden